The attention being given to the problem of childhood obesity has placed greater emphasis on students' eating more healthful diets and getting more exercise. "Children need 60 minutes of play with moderate to vigorous activity every day to grow up to a healthy weight," says the federal government's "Let's Move" initiative to encourage students to exercise more often. For schools, that means providing students not only with physical-education classes, but also with playgrounds where children on recess or before or after the school day can get a break from studies and get some physical activity in a non-structured setting. The National Program for Playground Safety (NPPS), based at the University of Northern Iowa, has a four-step national action plan for playgrounds: (1) provide proper playground supervision; (2) design age-appropriate playgrounds; (3) provide proper surfacing under and around equipment; and (4) keep equipment properly maintained. The U.S. Consumer Product Safety Commission (CPSC) Public Safety Handbook covers similar recommendations.